基于蒽-苯并咪唑鎓的荧光传感器对H2PO4-的高选择性识别

doi:10.11944/j.issn.1000-0518.2020.01.190165

摘要/Abstract

摘要：

设计合成了基于蒽-苯并咪唑鎓的受体分子1和2,通过荧光发射光谱研究了受体分子1和2对F^-、Cl^-、Br^-、I^-、AcO^-、HSO₄^-、H₂PO₄^-、NO₃^-、ClO₄^-等阴离子的识别性能。研究发现,在受体分子1和2的乙腈溶液(5.0×10^-6 mol/L)中加入10倍化学计量的H₂PO₄^-时,受体分子1的荧光猝灭百分数为13%,受体分子2的荧光猝灭百分数高达94%,表明受体分子2在构型上与H₂PO₄^-更匹配,可作为H₂PO₄^-的荧光关闭型(turn-off)探针。受体分子2与H₂PO₄^-的结合比为1:1,结合常数为(3.70±0.16)×10⁴ L/mol,检出限为3.77×10^-6 mol/L。

关键词: 蒽, 苯并咪唑鎓, 磷酸二氢根, 荧光探针

Abstract:

Two novel anthracene-benzimidazolium based receptors 1 and 2 were synthesized. The anion (F^-, Cl^-, Br^-, I^-, AcO^-, HSO₄^-, H₂PO₄^-, ClO₄^-,NO₃^-) binding properties of receptors 1 and 2 were evaluated in acetonitrile by fluorescence spectroscopy. The receptors 1 and 2 display fluorescent quenching effect with H₂PO₄^-, the quench percentage for receptor 1 is 13%,and for receptor 2 is as much as 94%. The results indicate that receptor 2 is more closely matched to H₂PO₄^- in configuration, and receptor 2 can behave as a “turn-off” fluorescence sensor for H₂PO₄^-. Job-plot shows that receptor 2 and H₂PO₄^- form a 1:1 complex, the binding constant is (3.70±0.16)×10⁴ L/mol, and the detection limit is 3.77×10^-6 mol/L.

Key words: anthracene, benzimidazolium, dihydrogen phosphate, fluorescent chemosensor

董智云, 张晓宇, 曾政权, 席福贵. 基于蒽-苯并咪唑鎓的荧光传感器对H₂PO₄^-的高选择性识别[J]. 应用化学, 2020, 37(1): 80-87.

DONG Zhiyun, ZHANG Xiaoyu, ZENG Zhengquan, XI Fugui. Anthracene-Benzimidazolium Based Fluorescent Chemosensor for Highly Selective Recogniton of H₂PO₄^-[J]. Chinese Journal of Applied Chemistry, 2020, 37(1): 80-87.

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基于蒽-苯并咪唑鎓的荧光传感器对H₂PO₄^-的高选择性识别

Anthracene-Benzimidazolium Based Fluorescent Chemosensor for Highly Selective Recogniton of H₂PO₄^-

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